<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>JSON响应</title>
</head>

<body>
    <style>
        #result {
            width: 200px;
            height: 100px;
            border: solid 1px #903;
        }
    </style>
</body>
<div id="result"></div>
<script>
    const result = document.getElementById("result");
    //绑定键盘按下事件
    window.onkeydown = function() {
        // 发送请求
        const xhr = new XMLHttpRequest();
        // 设置响应体的数据类型
        xhr.responseType = 'json';
        //初始化
        xhr.open('GET', 'http://127.0.0.1:8000/json-server');
        //发送
        xhr.send();
        //事件绑定
        xhr.onreadystatechange = function() {
            if (xhr.readyState === 4) {
                if (xhr.status >= 200 && xhr.status < 300) {
                    // result.innerHTML = xhr.response;
                    // 手动数据转化
                    // let data = JSON.parse(xhr.response);
                    // result.innerHTML = data.name;
                    // 自动转化  在上面设置响应体的数据类型
                    result.innerHTML = xhr.response.name;
                }
            }
        }
    }
</script>

</html>